Water on Floor by Comode

[williampt]

Water leak on floor on side of comodo from under the wall sometimes. Looks like it comes comode, but it comes under the wall.

[MidMOTraveler]

Most likely a Tetford toilet leaking at the valve in the back.
Take some paper towels and wrap that area and keep off floor. That will confirm area of the leak.
To repair replace toilet with a Dometic.

[DQDick]

Does it leak all the time or only when the flush has run recently? If it truly is coming from the wall and it comes some time after flush it's likely your backflow preventer.